Two bullets for each category in module

-- url of the page with the problem -- : www.dadatecnologia.com/categorias.html
-- HikaShop version -- : HikaShop Starter 2.3.0
-- Joomla version -- : 3.3.0
-- PHP version -- : 5.3.28
-- Browser(s) name and version -- : Google Chrome Versión 35.0.1916.114 m
-- Error-message(debug-mod must be tuned on) -- : No error

Hi, since I set the "Link on main categories" option to Yes in Parameters for Categories Options, I got two arrow bullets for each subcategory in the Categories menu, as you can see in the link above. What can I do in order to fix this?

Thanks in advance.